Op Amp Stereo Amplifier

Posted on Feb 4, 2014

The 100k potentiometers set the voltage level reaching the Op Amps. A dual ganged 100K-Ohm audio-taper potentiometer should be used over a linear taper or potentiometer. In some cases the component may be called a ganged stereo taper. The schematic does not show pin numbers for the Op Amps because the circuit works for either a single or dual package

Op Amp Stereo Amplifier
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Op Amp and of course a large number of different Op Amps. However to the right, some different pin numbering is shown. Note that [although not shown well] the two potentiometers are ganged together, one knob changes both potentiometers at the same time. So although each channel uses a different potentiometer they both move up or down at the same time producing a volume control. A separate balance control could also be added to change the volume of one channel, while reducing the other. Or a separate potentiometer could be added into each channel so that each channel would be adjusted up or down, with regard to the other. The amplifier could be constructed of either two individual Opamps or a package containing two Op Amps. The 741 is an example of a common Opamp having a single device within the package. Another common example would be a TL082 which is a component with two separate devices within the same package. The pin functions for both devices are shown the the right. Having two devices in the same package saves parts and and cost. However power dissipation is reduced by having two semiconductors operating in the same package, so a dual op-amp package may not be the way to go. Regardless of the Op Amp used or the number of devices in a package, always bypass the power pin Vcc [Vs, V+] to ground using a. 01uF capacitor [at a minimum]. Bypass capacitors are not shown in many of these schematic diagrams to make them less...

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